Alert archive / Virginia / Flash Flood Warnings in 1990

Flash Flood Warning 13, NWS Baltimore/Washington

October 13, 19904 counties in Virginia

NWS Baltimore/Washington issued this flash flood warning at Oct 13, 1990, 2:12 AM EDT for 4 counties in Virginia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Oct 13, 1990, 2:12 AM EDT (06:12 UTC)
Expired: Oct 13, 1990, 5:15 AM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Whole counties

Counties Clarke County, VA, Frederick County, VA, Page County, VA, Warren County, VA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 6.2 hours before the alert went out and 72 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 22 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KWBC 130631 COR
FFWWBC
MDC021-VAC187-043-069-139-840-WVC037-130915-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WASHINGTON DC
230 AM EDT SAT OCT 13 1990

THE NATIONAL WEATHER SERVICE IN WASHINGTON HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  515 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN NORTH CENTRAL MARYLAND

   ...FREDERICK COUNTY

IN NORTH CENTRAL VIRGINIA

   ...WARREN COUNTY

IN NORTHWEST VIRGINIA
   ...CLARKE COUNTY...FREDERICK COUNTY...CITY OF WINCHESTER

IN WEST CENTRAL VIRGINIA

   ...PAGE COUNTY

IN NORTHEAST WEST VIRGINIA

   ...JEFFERSON COUNTY

RADAR CONTINUES TO SHOW MODERATE TO HEAVY RAIN IN THE WARNING AREA.

AUTOMATED RAIN GAGES SHOW RAINFALL OCCURRING AT THE RATE OF ONE INCH
PER HOUR.

THESE RAINS ARE EXPECTED TO CONTINUE FOR THE NEXT 2 TO 3 HOURS...AND
SHOULD CAUSE RAPID RISES AND OVERFLOWS IN MANY SMALL STREAMS.

PERSONS IN THE WARNING AREA SHOULD BE READY FOR QUICK ACTION TO SAVE
LIVES AND PROTECT PROPERTY.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN DAREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

ERS

...CORRECTION TO ADD CITY OF WINCHESTER TO WARNING...

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 13, 1:06 AM EDT	Flash Flood Warning	LWX	Greene, Madison, Orange	3 hr
Oct 13, 1:06 AM EDT	Flash Flood Warning	LWX	Culpeper, Rappahannock	3 hr
Oct 13, 4:09 AM EDT	Flash Flood Warning	LWX	Culpeper, Madison, Rappahannock	2 hr
Oct 13, 4:09 AM EDT	Flash Flood Warning	LWX	Greene, Orange	2 hr
Oct 13, 4:59 AM EDT	Flash Flood Warning	LWX	Clarke, Frederick	61 min
Oct 13, 6:06 AM EDT	Flash Flood Warning	LWX	Clarke, Frederick	69 min

Nearby

Flash Flood Warnings in Virginia, 1990 Every flash flood warning in 1990

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.